【摘要】 为研究莴苣高产、优质、低污染、高氮肥利用率的合理氮肥施用量,采用盆栽试验与 15N 标记示踪技术, 分析了氮肥施用量与莴苣产量和品质及氮肥利用率的关系.根据试验结果,将每 1 kg 土的氮肥施用量 x(g)与每盆莴苣的产量 ? (g)拟合成回归方程为 ?=104.21+2 476.31x-5 181.97x2,表明莴苣产量随氮肥施用量的增加呈先增加后下降的变化趋势.每 1 kg 土的合理氮肥施用量为 0.175 0~0.212 5 g.适宜的氮肥施用量能改善莴苣品质,降低氮肥损失,提高氮肥利用率.更多还原

【Abstract】 To rationalize nitrogen application aiming at high yield,good quality,low pollution and high nitrogen use efficiency effects of nitrogen rates on yield and quality and nitrogen use efficiency of asparagus lettuce were studied by way of using N trace technique in pot experiment.The results showed that the correlation between nitrogen rates and 15 yield of Asparagus lettuce followed regression equation ?=104.21+2 476.31x-5 181.97x2 indicating yield increased and decreased in order accompanied by the increasing of nitrogen application;the adequate nitrogen rates could improve quality of asparagus lettuce,reduce nitrogen loss and increase nitrogen use efficiency.Adequate nitrogen rates for asparagus lettuce growth ranged from 0.175 0 to 0.212 5 g/kg.更多还原